Technical Inquiry on Internet Forums Subforums

[BoDragon]

I am in the early stages in updating/relocating one of my forums to a better system. I am looking for a multi-level forum system:

Board Name
-> Category
--> Forum Level 1 (Subcategory)
---> Forum Level 2 (Forum)
----> Forum Level 3 (Subforum)

I currently use a free host IP.board. They use Board Name -> Category -> Forum Level 1 (Subcategory) -> Forum Level 2 (Forum).

Does anyone know of any internet forum server that allows me to work with four or five levels of forums?